ChemistryIf 2.00 mL of 0.600 M NaOH are added to 1.000 L of 0.850 M CaCl2, what is the value of the reaction quotient and will precipitation occur? I've been trying this problem over and over and haven't been able to get it. I know precipitation will not occur from my previous ...
November 18, 2014

ChemistryKsp for Ca(OH)2 is 5.02 x 10^-8. The way to predict whether a precipitation will occur is to calculate Qsp and compare to Ksp. Qsp = (Ca2+)(OH-)^2. Concentration of OH- will be given by (M1V1/V2) = 0.0012 Qsp = 0.850 * (.0012)^2 = 1.22*10^-6 My homework says this is not ...
November 18, 2014

ChemistryIf 2.00 mL of 0.600 M NaOH are added to 1.000 L of 0.850 M CaCl2, what is the value of the reaction quotient and will precipitation occur? I've been trying this problem over and over and haven't been able to get it. I know precipitation will not occur from my previous ...
November 18, 2014

mathI haven't learned how to find a function. Do you mind walking me through it?
June 4, 2014

mathLiam is the founder and president of the Justin Bieber Fan Club. As a fundraiser, the JBFC sells chocolate-flavored spaghetti sauce. The current price is $6.40 per jar and their average monthly sales are 250 jars. They are considering raising prices and have been surveying ...
June 4, 2014

Physicswhat will be the final temp of 500g of 21c waterbullets are dropped in? when 500g of 324c lead
April 16, 2014

PsychologyFor each of the following research questions, indicate the following: (1) the type of research that would best answer the question, 2) an appropriate sampling method, and 30 the best method of collecting the data. a) How do the minority groups at a certain university view the ...
October 28, 2013

STATSrecent 10K run the finisher are norm dist with a mean of 55 min and stand dev of 13 A) determine the percentage of finishers with times between 45 and 75 min B) determine the percentage of finshers less than 80 min C) obtain the 30th percentile D) find the 8th decile
April 27, 2012

Applying Algebraic Thinking to DataSnoopy is in his plane, 4500 ft above ground. he fires a projectile straight up. The Vo of the projectile is 340 ft/s. (after the projectile is fired, it has no acceleration, so its height can be modeled by a "falling body" model). The Red baron is maintaining a ...
April 20, 2012

Psychology ObservationsThis is a PSY230 question for a large grade. I think doing your own homework is better. If you need help with the definitions then go to your online book page 17-19 and this will help on how to do this work.
August 14, 2010

microbiologyDue to the prospect of interplanetary travel, how would you attempt to isolate and identify a bacterial infection acquired on another planet? This bacteria is unknown to use and does not appear in Bergey's or the manual of clinical microbiology.
April 29, 2010

PhysicsIf the radius of curvature of the bump is r = 29 m, find the apparent weight of a 60 kg person in your car as you pass over the top of the bump at 12 m/s.
January 7, 2010

mathYes, both ways are the same. The way the other person told you is in what is called y-intercept form, and the form that you have it in right now (4x - y = 7, I think it was) is called standard form. Basically, just by adding and subtracting things to move them around, you can ...
February 17, 2009

mathAll you have to do is try out some numbers. An easy way is to place 0 in for x and y to find some easy x and y-intercept points. Just plug in 0 for x. 4 times 0 is obviously 0, so 0 minus what equals 7? 7. Do the same for y. Hope I helped! :-)
February 17, 2009

AlgebraOkay... I think the thing we need to do is find another equation then try the elimination method. But what would be another equation? Hmm... :-) Would it (possibly) be a - 15 = b, because 15 mins later, it was (b) minutes after three o'clock?
February 17, 2009

AlgebraAt a certain time, Janice notices that her digital watch reads (a) minutes after two o'clock. Fifteen minutes later, it reads (b) minutes after three o'clock. She is amused to note that (a) is six times greater than (b). What time was it when she looked at her watch ...
February 17, 2009

Algebra 1Sorry... I tried my best to explain it. Did you look back at my other explanation to the first time you asked it? That might help. It's basically the way our teacher showed us.
February 17, 2009

Algebra 1Mel, I told you already-- 120 and 121. How much they weigh together would be one number-- 141, I guess. I actually don't know how you would figure that part out, but the second part is correct.
February 17, 2009

Thanks!Yes, Chopsticks, after trying the way I described in my last response, I got the same answers you have. Thank you for your help! :-)
February 17, 2009

algebraWow... 1/2 of a ball. :-) I see what you were trying to get across... but our teacher never showed us a problem like this... so frustrating. I don't know if your ratio way is exactly right, but it is a good way to straighten out the info. Wait... I got something! Maybe it...
February 17, 2009

algebra5 green balls and 2 red balls together weigh 10 pounds, and 1 green ball and 4 red balls together weigh 7 pounds. If all red balls weigh the same amount and all green balls weigh the same, then what is the weight of 8 red and 8 green balls together? I'm not sure at all how...
February 17, 2009

AlgebraThe sum of Eric and Bob's weights is 9 times greater than the difference of their weights. The positive difference of their weights is also 240 pounds less than the sum. If Eric weighs less than Bob, find Bob's weight. I am not sure at all how to solve this, especially...
February 17, 2009

Algebra1Hey Melanii (nooni)! :-) It's me! Anyway, I figured this one out. Well, drwls actually did tell you what you were looking for... their weights. Tweedledee will weigh 121 pounds and Tweedledum will weigh 120 pounds. Here are the two equations as our teacher showed us: e + ...
February 17, 2009

spanishI know all of the spanish sports vocabulary, but I don't know how to put it in a sentence. For example, "I play tennis with a tennis racquet. We play golf with a golf ball. They play soccer with soccer balls." Thank you.
December 19, 2008

Algebra: factoringI need to find the value of x. 9x^3 + 9x = 30x^2 It's confusing because apparently I have to do 9x^3 + 9x and then add the + 30x^2 to it, and then make it equal 0, so it ends up like this: 9x^3 + 9x + 30x^2 = 0 And afterward, I would factor it. How do you factor it? I'...
December 4, 2008

chemistryWhat pressure would have to be applied to steam at 325°C to condense the steam to liquid water (ÄH vap = 40.7 kJ/mol)? Responses Dr bob please! Chemistry - GK, Friday, November 28, 2008 at 11:47pm Use the Clausius-Clapeyron Equation to calculate the vapor pressure at ...
November 30, 2008

Dr bob please! Chemistryhi, i think this prob has to do what you did the last time but how does pressure play appart in this chapter?? What pressure would have to be applied to steam at 325°C to condense the steam to liquid water (ÄH vap = 40.7 kJ/mol)?
November 28, 2008

Chemistrywow, thank you. when do you use the equation -qhot=qcold? I dont really understand fully q3 and q4 for q3 why do u have to use 24g ice but u use the Cp of water and not ice. and for q4 and we used another water equation... why do we have to do this twice? thanks so much!
November 28, 2008

ChemistryA 24.0 g sample of ice at -19.0°C is mixed with 118.0 g of water at 85.0°C. Calculate the final temperature of the mixture assuming no heat loss to the surroundings. The heat capacities of H2O(s) and H2O(l) are 2.08 and 4.18 J/g°C, respectively, and the enthalpy of...
November 28, 2008

AlgebraHi! Does anyone know a simple way to program the quadratic formula into a TI-83 (Texas Instruments?) I googled it, but most of the results required downloading (I don't have a connecting cable), or a bunch of keys that I couldn't find on my computer. Let me know if ...
November 12, 2008

AlgebraWhat do you do when you have a quadratic equation such as x^2=2x-5, and there is no c value? Should you leave c as zero? one? Or just omit c entirely?
November 12, 2008

AlgebraI used an online math site, to explain quadratic equations. But the thing is, they said that (-4)^2 is 16, but my calculator said -16. Why is that? And also, how does the square root of 40 break down into the square root of 4 and the square root of ten? Does this have to do ...
November 12, 2008

Algebra II I am expected to use the quadratic equation for the following: x2 + 3x  4 = (x + 4)(x  1) = 0. Once this is plugged into the value of x (the long equation, which I am unable to copy from the internet, but it goes -3 plus or minus the square root of...) I got -8/2...
November 12, 2008

AlgebraThanks for those who answered my previous question! I have just one more: x^2-625=0, what is the GCF? How is it deterimined? It does not appear to me that there is one. How would it then be factored and have the zero-product powers applied? Then, what about 120x^2-34x-21=0 (...
November 10, 2008

AlgebraHi! I have a few questions about Factoring Quadratic Expressions. My first one is 12x^2+x=6. How would you facor that? My second is how would x^4-1 equal the answer 1(x^4-1)(x^2=1)(x^2-1)? Finally, how would you factor something such as -3x(x+2)-8(x+2), when there is no common...
November 10, 2008

Algebra III am doing the piecewise function x+3 if x is less than -2 x^2 if -2 is less than or equal to x which is less than 1, and finally, -x+2 if x is greater than one. The chart says that x x+3 (x,y) -3 0 -3,0 -2 1 -2,1 How come the three is negative? Is there a rhyme or reason to ...
November 5, 2008

arithmeticBarry and Steve are good friends. Barry wants to buy a new computer, but he doesn't have the money for it right now. Barry says he will pay Steve $2000.00 in five years if Steve gives him $1600.00 for the computer today. Steve figures that there is an interest rate of 6% ...
June 9, 2008

EnglishHas anyone read the book Girl in Hyacinth Blue by Susan Vreeland? If you have I need to draw a picture for each chapter to represent that chapter. Help? I haven't read this book, but drawing a picture for each chapter shouldn't be that difficult if you've read it. ...
April 15, 2007

ScienceWhat type of charge moves through conductors? Explain how it moves. thanks Electrons are the current carriers in metals. Electrons have a negative charge. Electrons in metals are loosly bound to atoms, so an external electric field will cause them in their random movements to ...
November 29, 2006